Answer :

Solve the given equation as shown below

[tex]\begin{gathered} 3y+4y-5=51 \\ \Rightarrow7y-5=51 \\ \Rightarrow7y=51+5=56 \\ \Rightarrow7y=56 \\ \Rightarrow y=\frac{56}{7} \\ \Rightarrow y=8 \end{gathered}[/tex]

Thus, the answer is y=8

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